Featured Post Slider in 'Clear' theme

Hi! I have been trying for the past week to get the Featured Post Slider working in the Clear theme and have not been close! The instructions I have been given are the following:

“If you want a post to appear in the featured content section, simply tag the post with the “featured” tag. To add a tag, find the “Post Tags” box on the right side of the Add Post screen and enter it there.
Please Note: The slug for the “featured” tag must be featured for the slider to show posts. If this is not possible, you may instead replace “featured” with “featured-2″ (or the current post tag slug) in the featured-wide.php and featured-narrow.php templates.

I’ve tried this and loads of trial and error but nothing seems to work…the site is meant to launch today and I’m pulling my hair out!”

If anyone has any suggestions I would be incredibly grateful!

Thanks 🙂